I believe I have figured out exactly what these are. They were sold as WWII but I believe they are actually made from WWII aluminum detonator caps used either in shells or used to detonate the panzerfaust warhead. I believe I have seen these reference with 8cm mortar rounds but I also seem to find a lot of reference to the panzerfaust as well. They are likely early post war made from left over war materials. The top and bottom are marked fde Np10 but it can bee a little hard to make out though the pressed in ribs; There is a little variation in these and not every one has the ribbed design on top and bottom, sorry, no choice. It took a little more research to figure it out what their story was. These are decent little lighters, they may need a new flint. The price is for 1 lighter. Each lighter is about 2in. tall.